This is a very good build if you want a fast, strong and little bit tanky udyr.

I think it's best to go top because u get more farm and get those items faster.

Udyr is a champion famed for his high versatility, and his ability to adapt to his enemies. Knowing this, a single build of Udyr is just not reasonable. A cookie-cutter build is not viable either as each game demands that you adapt to your enemies. In this guide, i will be showcasing 2 playstyles for Udyr, Phoenix-Tiger and Laning Tiger.

Phoenix-Tiger

This is the type of playstyle that I prefer to use. Utilizing Phoenix Stance's extremely potent early-mid game DPS, and high farming/jungling capabilities, you can output very high amounts of DPS throughout early-mid game. However, because phoenix "peaks" out during this time, precautions are made to ensure your DPS is maintained, and even improves as the game get longer. This solution is found in the use of Tiger stance. How this is done, is explained in the "Phoenix-Tiger" section of the guide.

Pure Tiger

Unfortunately i feel as though this playstyle has lost viability. The fact that tiger has to burn more mana than phoenix for jungling has a large impact and slows you down greatly when forced to turtle for mana. With the new jungle, you have to be more aware of ganking opportunities, and be ready for them at any time, tiger just can't do that. Due to this, i have removed this section of the guide. However, Laning tiger is still viable, given the right conditions.

Laning Tiger

An archetype whose outcome depends upon the enemy team's choice of top lane composition, Laning Tiger Udyr cannot be stopped when the right conditions are met. Using the brute force of Tiger stance to deny the enemy farm, and the sustain power from Turtle stance, This playstyle quickly snowballs into nuclear killing machine.

Monkey's Agility

Entering a stance grants Udyr 10% attack speed and 3% dodge for 5 seconds. This effect can stack.

A decent passive that becomes more important as the game goes on and you have mana to maintain stacks. It caps at 3 stacks totaling 30% attack speed and 9% dodge bonus.

Tiger Stance

Persistent Effect: Udyr's attack speed is increased by 20/25/30/35/40%.

Activation: Udyr gains an additional 15/20/25/30/35% attack speed for 5 seconds after activating Tiger stance. While active or for 5 second after Activation, Udyr's next attack deals 170% his attack damage plus 30/80/130/180/230 over 2 seconds as magic damage.

Cost
55/50/45/40/35 Mana

The larger part of this skill comes from the activation effect, not the persistent effect. The DoT that this skill can deliver has the potential to be devastating. The facet of this skill that makes it dangerous is pre-loading. You can maintain the on-next-hit effect of this stance for 5 seconds after changing stance out of it. This can result in massive spike from 2 consecutive tiger DoTs in close succession.

If you are running Laning Tiger, you should always be maxing this skill. However if you run Phoenix-Tiger, it is not always the smartest idea to max this skill. The AD scaling of the skill does not change with rank, and the ATS boost/rank is a pitiful 5%/5%.

Turtle Stance

Persistent Effect: Udyr's attacks cannot crit, but he restores 10/12/14/16/18% of his damage as health and 5/6/7/8/9% of his damage as mana.

Activation: Udyr gains a temporary shield that absorbs 60/100/140/180/220 (+0.5 AP) damage.

Cost
55/50/45/40/35 Mana

One of the biggest things to take note of about the turtle shield is that it IS affected by your resistances, meaning that 220 shield will block 550 damage with a resistance of 150.

As of the 1.0.0.120 patch, the steal from Turtle Stance is no longer based on raw damage before reduction and is now calculated post damage reduction. Consider it lifesteal w/ mana

Bear Stance

Persistent Effect: Udyr mauls his target with such force that they are stunned for 1 second. This effect cannot occur on the same target for 6 seconds.

Activation: Udyr gains 15/18/21/24/27% increased movement speed for 2/2.5/3/3.5/4 seconds.

Cost
55/50/45/40/35 Mana

This is your Swiss Army Knife of stances. Initiation, interruption, chasing, fleeing, this stance has its uses in just about every part of the game. However, it is important to note that movement speed has a soft cap at about 500; this means that any additional movement speed past this point will give diminishing returns. With boots, bear stance will bring you very close to this soft cap, making the use of ghost less effective. It is also important to note that ranking bear stance has no effect on the duration of your stun. The combination of these elements makes maxing bear stance not always the wisest decision.

Phoenix Stance

Persistent Effect: Every third attack, Udyr engulfs enemies in front of him in flame, dealing (40 / 80 / 120 / 160 / 200) (+0.25 AP) magic damage.

Activation: Udyr sends out pulsing waves of fire dealing (15 / 25 / 35 / 45 / 55) (+0.25 AP) magic damage each second to nearby enemies for 5 seconds. In addition, Udyr's ability power is increased by (15 / 25 / 35 / 45 / 55) and his attack damage is increased by half of that amount.

Cost
55/50/45/40/35 Mana

This stance is rather self-explanatory. The larger part of the DPS of this skill comes from simply staying in this stance. Every third hit releases a burst of AoE damage. Unlike Tiger Stance, Damage comes from being in the stance, not activating the stance.

Marks.
I think AS is the best for udyr but ArP works to!

Seal.
Armor!

Glyph.
Magic Resist!

Quintessence.
As, Arp works to!

I use to start with Boots and 3 Health Potions. Then i go for Madred's Razor, really good to farm with. Then i go for full boots. It's really good to have a fast udyr. then i want Spirit Visage and Madred's Bloodsrazor. After that i go for Guinsoo's Rageblade. Now you have really good AS so i usually go for more movement speed and Shurelya's Reverie. After that if the game is getting really long i go for wit's End and Trinity Force.

Summoner Spells

I prefere Flash and Exhaust / Flash and Ignite.

Flash. I use flash so I can escape or initiate fights. It's still a good summmoner spell after nerf. Can be used in in many good ways with udyr like flash to stun and kill an enemy.

Exhaust. Exhaust will stop enemies damage and make them easier to kill. Also userfull when chasing

Ignite. Ignite is good if you want that extra damage early game at top.

The mystics of Ionia delve into the deepest mysteries of Valoran, pioneering the most inner depths of spirituality. Their adepts are some of the most devout proponents of enlightenment and harmony...but as is always the case, there are those who follow a very different path. Born in a grassy clearing under a red moon, Udyr has always been compelled by the primal drive within him. His will was not untempered, simply undomesticated. As a boy, he toiled on his father's farm, but he felt a much deeper connection with the mustangs that would graze in the distant fields than with the townsfolk who would visit. Oftentimes he was dragged into the house at night with a swat and a scolding when his parents would find him sleeping beneath the stars.

On the day of his sixteenth birthday, Udyr bade his family farewell and struck a path to the east, determined to shed the trappings of ''civilized'' society. Freed of the shackles of cultural expectations, Udyr tapped into a well of inner ferocity he hadn't known before. His feral senses roiled to the surface and he let them overcome him. It was at this point in his life that Udyr truly lost his humanity. Poachers and travelers who entered his territory did so at terrible risk, and rarely managed to leave it.

A monk on a long journey passed through his woods one day, and Udyr decided to scare him, leaping from a nearby brush. The monk casually turned and redirected Udyr to one side. Udyr, enraged, tried time and time again to best him, but the monk was unassailable. When Udyr was exhausted, the monk wordlessly beckoned him to follow, and together they walked in silence to the Hirana Monastery. The monks there took him in, and taught him to harness and control his animalistic fury...most of the time.